and tsunami, a desperate search for food, water and missing loved ones. and on the u.s. west coast, fears of radiation results in a run on potassium iodide. but is there really cause for concern? captioning sponsored by cbs from cbs news world headquarters in new york, this is the "cbs evening news" with katie couric. >> couric: good evening, everyone. japan is dealing tonight with the aftermath of one catastrophe while trying to prevent another. we'll have much more about the earthquake and tsunami in a moment. the official death toll is nearly 3,400. but first, the nuclear crisis. radiation continues to leak from damaged nuclear reactors in fukushima, 140 miles north of tokyo. an estimated 50 workers are still trying desperately to cool them to prevent a meltdown. in the meantime, 70,000 people have been evacuated from an area within 12 miles of the dai-ichi plant and 140,000 more living within 120 miles of the facility have been told to stay inside. japan has imposed a no-fly zone over that area for commercial air traffic. the white house, meanwhile, says the u.s. is not calling on ame
